<!DOCTYPE html>
<!--
This file cannot be upstreamed to WPT until:
* internals.setPermission() usage is replaced with a WebDriver API
-->
<title>Access to the Accelerometer API is deferred</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<body>
<script>
promise_test(async t => {
  const bc = new BroadcastChannel('test-channel');
  t.add_cleanup(_ => bc.close());

  // We grant the permission here to make a more discerning test because
  // Accelerometer() waits until the permission is granted, which
  // is deferred during prerendering so the test would trivially pass without
  // the permission.
  await internals.setPermission({name: 'accelerometer'}, 'granted',
                                  location.origin, location.origin);

  const gotMessage = new Promise(resolve => {
    bc.addEventListener('message', e => {
      resolve(e.data);
    }, {
      once: true
    });
  });
  const url = `resources/generic-sensor.https.html?sensorName=Accelerometer`;
  window.open(url, '_blank', 'noopener');

  const result = await gotMessage;
  const expected = [
    {
      event: 'started waiting Accelerometer test',
      prerendering: true
    },
    {
      event: 'prerendering change',
      prerendering: false
    },
    {
      event: 'finished waiting Accelerometer test',
      prerendering: false
    },
  ];
  assert_equals(result.length, expected.length);
  for (let i = 0; i < result.length; i++) {
    assert_equals(result[i].event, expected[i].event, `event[${i}]`);
    assert_equals(result[i].prerendering, expected[i].prerendering,
      `prerendering[${i}]`);
  }
}, `the access to the Accelerometer API should be deferred until the prerendered
    page is activated`);

</script>
</body>
